OK. Here you go. I have tweaked the latest version of the mod, as installed by 0.11.10.0_09 of Aslain's modpack.
Replace ..res_mods\gui\unbound2\autospy\adjustable_markers\!as_ship_marker.unbound with the file I attached.
The changes are not really trivial: 6 additions and 5 deletions. I have fully commented all my edits, just search for Capt_Oveur in the file. You will have to manually edit the file and set the 5 colors you wanted to be changed at the top of the file to colors that work for you. I have set all five (player's name; enemy ship name; ally ship name; HP and distance) to the color 'gold' (FFCC66). WG recommends using web safe colors, there are websites you can look up their hex values, for example here:
https://htmlcolorcodes.com/color-chart/web-safe-color-chart/
I really hope this will work for you. Aslain will be able to tell you how to preserve it when you are reinstalling the modpack and probably even how to update the mod if it changes in the future. Do not hesitate to ask if you have any questions! Cheers!
...Capt_Oveur
!as_ship_marker.unbound